Quick question about booster pulls

So I want to buy a box or two of some alliances unraveled booster packs, but from what I hear, some cards can't be pulled from boosters. Like I thought I heard past creatures can't be pulled, and certain ultras can't be pulled from the booster packs. So does anyone know which cards cannot be pulled from a booster pack? Any help would be much appreciated. Many thanks in advance

in Gameplay tips there's a thread called I'm a little confused, you can find lists on the second page of that, but for Alliances Unraveled, it's just any past card that can't be pulled from packs and will need to be pulled from starters instead